Teleseismic evidence for a low-velocity body under the Coso geothermal area
Journal Article: Teleseismic evidence for a low-velocity body under the Coso geothermal area
AbstractTeleseismic P wave arrivals were recorded by a dense array of seismograph stations located in the Coso geothermal area, California. The resulting pattern of relative residuals an area showing approximately 0.2-s excess travel time that migrates with changing source azimuth, suggesting that the area is the 'delay shadow' produced by a deep, low-velocity body. Inversion of the relative residual data for three-dimensional velocity structure determines the lateral variations in velocity to a depth of 22.5 km beneath the array. An intense low-velocity body, which concides with the surface expressions of late Pleistocene rhyolitic volcanism, high heat flow, and hydrothermal activity, is resolved between 5- and 20-km depth. It has maximum velocity contrast of over 8% between 10 and 17.5 km. The shallowest part of this body is centered below the region of highest heat flow; at depth it is elongate in approximately the N-S direction. The hypothesis that this low-velocity body is caused by the presence of partial melt in the middle crust is consistent with the local seismic, geologic, and thermal data.
- Reasenberg, P.; Ellisworth, W.; Walter and A.
- Published Journal
- Journal of Geophysical Research, 5/10/1980
- Not Provided
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Reasenberg, P.; Ellisworth, W.; Walter, A. . 5/10/1980. Teleseismic evidence for a low-velocity body under the Coso geothermal area. Journal of Geophysical Research. (!) .